rubber stamp
US /ˈrʌb.ər ˌstæmp/
UK /ˈrʌb.ər ˌstæmp/

1.
2.
a person or organization that gives approval to something without much thought or opposition
:
•
The parliament has become a mere rubber stamp for the executive's decisions.
•
He was criticized for being a rubber stamp for the CEO's agenda.
1.
to approve or authorize something automatically or without proper consideration
:
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The committee is expected to simply rubber stamp the new policy.
•
Don't just rubber stamp every decision; think critically.